
package com.hulk.dryad.admin.codegen;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.StrUtil;


import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.hulk.dryad.common.constant.CommonConstants;
import com.hulk.dryad.common.constant.enums.BEC;
import com.hulk.dryad.common.constant.enums.StyleType;
import com.hulk.dryad.common.exception.CheckedException;
import com.hulk.dryad.common.util.SpringContextHolder;
import com.hulk.dryad.persistence.entity.*;
import com.hulk.dryad.persistence.entity.enums.DsJdbcUrlEnum;
import com.hulk.dryad.persistence.mapper.GenDatasourceConfMapper;
import com.hulk.dryad.persistence.mapper.GeneratorMapper;
import lombok.SneakyThrows;
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;

import org.apache.commons.configuration2.Configuration;
import org.apache.commons.configuration2.builder.fluent.Configurations;
import org.apache.commons.configuration2.ex.ConfigurationException;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.springframework.context.ApplicationContext;


import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 代码生成器 工具类
 *
 * @author kim
 * @date 2018-07-30
 */
@Slf4j
@UtilityClass
public class GenUtils {

	public final String CRUD_PREFIX = "export const tableOption =";

	private final String ENTITY_JAVA_VM = "Entity.java.vm";

	private final String MAPPER_JAVA_VM = "Mapper.java.vm";

	private final String SERVICE_JAVA_VM = "Service.java.vm";

	private final String SERVICE_IMPL_JAVA_VM = "ServiceImpl.java.vm";

	private final String CONTROLLER_JAVA_VM = "Controller.java.vm";

	private final String MAPPER_XML_VM = "Mapper.xml.vm";

	private final String MENU_SQL_VM = "menu.sql.vm";

	private final String AVUE_INDEX_VUE_VM = "avue/index.vue.vm";

	private final String ELE_INDEX_VUE_VM = "element/index.vue.vm";

	private final String ELE_ADD_UPDATE_VUE_VM = "element/form.vue.vm";

	private final String AVUE_API_JS_VM = "avue/api.js.vm";

	private final String AVUE_CRUD_JS_VM = "avue/crud.js.vm";

	private final String ELE_API_JS_VM = "element/api.js.vm";

	//新增
	private final String STRUCT_JAVA_VM = "Struct.java.vm";
	private final String VO_JAVA_VM = "Vo.java.vm";

	/**
	 * 配置
	 * @param config
	 * @return
	 */
	private List<String> getTemplates(GenConfModel config) {
		List<String> templates = new ArrayList<>();
		templates.add("template/Entity.java.vm");
		templates.add("template/Mapper.java.vm");
		templates.add("template/Mapper.xml.vm");
		templates.add("template/Service.java.vm");
		templates.add("template/ServiceImpl.java.vm");
		templates.add("template/Controller.java.vm");
		templates.add("template/menu.sql.vm");
		// 新增
		templates.add("template/Struct.java.vm");
		templates.add("template/Vo.java.vm");

		if (StyleType.ELEMENT.getStyle().equals(config.getStyle())) {
			templates.add("template/element/index.vue.vm");
//			templates.add("template/element/form.vue.vm");
			templates.add("template/element/api.js.vm");
		}
		else {
			templates.add("template/avue/api.js.vm");
			templates.add("template/avue/index.vue.vm");
			templates.add("template/avue/crud.js.vm");
		}

		return templates;
	}

	/**
	 * 生成代码
	 * @return
	 */
	@SneakyThrows
	public Map<String, String> generatorCode(GenConfModel genConfModel, Map<String, String> table,
											 List<Map<String, String>> columns, ZipOutputStream zip, GenFormConfModel formConf) {
		// 配置信息
		Configuration config = getConfig();
		boolean hasBigDecimal = false;
		// 表信息
		GenTableEntity tableEntity = new GenTableEntity();
		tableEntity.setTableName(table.get("tableName"));

		if (StrUtil.isNotBlank(genConfModel.getComments())) {
			tableEntity.setComments(genConfModel.getComments());
		}
		else {
			tableEntity.setComments(table.get("tableComment"));
		}

		String tablePrefix;
		if (StrUtil.isNotBlank(genConfModel.getTablePrefix())) {
			tablePrefix = genConfModel.getTablePrefix();
		}
		else {
			tablePrefix = config.getString("tablePrefix");
		}

		tableEntity.setDbType(table.get("dbType"));
		// 表名转换成Java类名
		String className = tableToJava(tableEntity.getTableName(), tablePrefix);
		tableEntity.setCaseClassName(className);
		tableEntity.setLowerClassName(StringUtils.uncapitalize(className));
		// 获取需要在swagger文档中隐藏的属性字段
		List<Object> hiddenColumns = config.getList("hiddenColumn");
		// 列信息
		List<GenColumnEntity> columnList = new ArrayList<>();
		for (Map<String, String> column : columns) {
			GenColumnEntity columnEntity = new GenColumnEntity();
			columnEntity.setColumnName(column.get("columnName"));
			columnEntity.setDataType(column.get("dataType"));
			columnEntity.setComments(column.get("comments"));
			columnEntity.setExtra(column.get("extra"));
			columnEntity.setNullable("NO".equals(column.get("isNullable")));
			columnEntity.setColumnType(column.get("columnType"));
			// 隐藏不需要的在接口文档中展示的字段
			if (hiddenColumns.contains(column.get("columnName"))) {
				columnEntity.setHidden(Boolean.TRUE);
			}
			else {
				columnEntity.setHidden(Boolean.FALSE);
			}
			// 列名转换成Java属性名
			String attrName = columnToJava(columnEntity.getColumnName());
			columnEntity.setCaseAttrName(attrName);
			columnEntity.setLowerAttrName(StringUtils.uncapitalize(attrName));

			// 列的数据类型，转换成Java类型
			String attrType = config.getString(columnEntity.getDataType(), "unknowType");
			columnEntity.setAttrType(attrType);
			if (!hasBigDecimal && "BigDecimal".equals(attrType)) {
				hasBigDecimal = true;
			}
			// 是否主键
			if ("PRI".equalsIgnoreCase(column.get("columnKey")) && tableEntity.getPk() == null) {
				tableEntity.setPk(columnEntity);
			}

			columnList.add(columnEntity);
		}
		tableEntity.setColumns(columnList);

		// 没主键，则第一个字段为主键
		if (tableEntity.getPk() == null) {
			tableEntity.setPk(tableEntity.getColumns().get(0));
		}

		// 封装模板数据
		Map<String, Object> map = new HashMap<>(16);
		map.put("dbType", tableEntity.getDbType());
		map.put("tableName", tableEntity.getTableName());
		map.put("pk", tableEntity.getPk());
		map.put("className", tableEntity.getCaseClassName());
		map.put("classname", tableEntity.getLowerClassName());
		map.put("pathName", tableEntity.getLowerClassName().toLowerCase());
		map.put("columns", tableEntity.getColumns());
		map.put("hasBigDecimal", hasBigDecimal);
		map.put("datetime", DateUtil.now());

		if (StrUtil.isNotBlank(genConfModel.getComments())) {
			map.put("comments", genConfModel.getComments());
		}
		else {
			map.put("comments", tableEntity.getComments());
		}

		if (StrUtil.isNotBlank(genConfModel.getAuthor())) {
			map.put("author", genConfModel.getAuthor());
		}
		else {
			map.put("author", config.getString("author"));
		}

		if (StrUtil.isNotBlank(genConfModel.getModuleName())) {
			map.put("moduleName", genConfModel.getModuleName());
		}
		else {
			map.put("moduleName", config.getString("moduleName"));
		}
		//新增
		if (StrUtil.isNotBlank(genConfModel.getModulePersistence())) {
			map.put("modulePersistence", genConfModel.getModulePersistence());
		}
		else {
			map.put("modulePersistence", config.getString("modulePersistence"));
		}
		if (StrUtil.isNotBlank(genConfModel.getModulePersistence())) {
			map.put("moduleService", genConfModel.getModulePersistence());
		} else {
			map.put("moduleService", config.getString("moduleService"));
		}
		if (StrUtil.isNotBlank(genConfModel.getPackageName())) {
			map.put("package", genConfModel.getPackageName());
			map.put("mainPath", genConfModel.getPackageName());
		}
		else {
			map.put("package", config.getString("package"));
			map.put("mainPath", config.getString("mainPath"));
		}

		// 渲染数据
		return renderData(genConfModel, zip, formConf, tableEntity, map);
	}

	/**
	 * 渲染数据
	 * @param genConfModel 配置信息
	 * @param zip 流 （为空，直接返回Map）
	 * @param formConf 表单信息
	 * @param tableEntity 表基本信息
	 * @param map 模板参数
	 * @return map key-filename value-contents
	 * @throws IOException
	 */
	private Map<String, String> renderData(GenConfModel genConfModel, ZipOutputStream zip, GenFormConfModel formConf,
										   GenTableEntity tableEntity, Map<String, Object> map) throws IOException {
		// 设置velocity资源加载器
		Properties prop = new Properties();
		prop.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");

		Velocity.init(prop);
		VelocityContext context = new VelocityContext(map);

		// 获取模板列表
		List<String> templates = getTemplates(genConfModel);
		Map<String, String> resultMap = new HashMap<>(8);

		for (String template : templates) {
			// 如果是crud
			if (template.contains(AVUE_CRUD_JS_VM) && formConf != null) {

				String fileName = getFileName(template, tableEntity.getCaseClassName(), map.get("package").toString(),
						map.get("moduleName").toString(),map.get("modulePersistence").toString(), map.get("moduleService").toString());
				String contents = CRUD_PREFIX + formConf.getFormInfo();

				if (zip != null) {
					zip.putNextEntry(new ZipEntry(Objects.requireNonNull(fileName)));
					IoUtil.write(zip, StandardCharsets.UTF_8, false, contents);
					zip.closeEntry();
				}

				resultMap.put(template, contents);
				continue;
			}

			// 渲染模板
			StringWriter sw = new StringWriter();
			Template tpl = Velocity.getTemplate(template, CharsetUtil.UTF_8);
			tpl.merge(context, sw);

			// 添加到zip
			String fileName = getFileName(template, tableEntity.getCaseClassName(), map.get("package").toString(),
					map.get("moduleName").toString(),map.get("modulePersistence").toString(), map.get("moduleService").toString());

			if (zip != null) {
				zip.putNextEntry(new ZipEntry(Objects.requireNonNull(fileName)));
				IoUtil.write(zip, StandardCharsets.UTF_8, false, sw.toString());
				IoUtil.close(sw);
				zip.closeEntry();
			}
			resultMap.put(template, sw.toString());
		}

		return resultMap;
	}

	/**
	 * 列名转换成Java属性名
	 */
	public String columnToJava(String columnName) {
		return WordUtils.capitalizeFully(columnName, new char[] { '_' }).replace("_", "");
	}

	/**
	 * 表名转换成Java类名
	 */
	private String tableToJava(String tableName, String tablePrefix) {
		if (StringUtils.isNotBlank(tablePrefix)) {
			tableName = tableName.replaceFirst(tablePrefix, "");
		}
		return columnToJava(tableName);
	}

	/**
	 * 获取配置信息
	 */
	public Configuration getConfig() {
		try {
			Configurations configs = new Configurations();
			return configs.properties("generator.properties");
		}
		catch (ConfigurationException e) {
			throw new CheckedException(BEC.E_2022);
		}
	}

	/**
	 * 获取文件名
	 */
	private String getFileName(String template, String className, String packageName, String moduleName,String modulePersistence, String moduleService) {
		String packagePath = CommonConstants.BACK_END_PROJECT + File.separator + "src" + File.separator + "main"
				+ File.separator + "java" + File.separator;
		String packagePersistencePath = packagePath;
		String packageServicePath = packagePath;
		if (StringUtils.isNotBlank(packageName)) {
			packagePath += packageName.replace(".", File.separator) + File.separator + moduleName + File.separator;
		}
		//新增
		if (StringUtils.isNotBlank(packageName)) {
			packagePersistencePath += packageName.replace(".", File.separator) + File.separator + modulePersistence + File.separator;
			packageServicePath += packageName.replace(".", File.separator) + File.separator + moduleService + File.separator;
		}else {

		}
		if (template.contains(ENTITY_JAVA_VM)) {
			return packagePersistencePath + "entity" + File.separator + className + ".java";
		}

		if (template.contains(MAPPER_JAVA_VM)) {
			return packagePersistencePath + "mapper" + File.separator + className + "Mapper.java";
		}

		if (template.contains(SERVICE_JAVA_VM)) {
			return packageServicePath + "service" + File.separator + className + "Service.java";
		}

		if (template.contains(SERVICE_IMPL_JAVA_VM)) {
			return packageServicePath + "service" + File.separator + "impl" + File.separator + className + "ServiceImpl.java";
		}

		if (template.contains(CONTROLLER_JAVA_VM)) {
			return packagePath + "controller" + File.separator + className + "Controller.java";
		}

		//新增
		if (template.contains(STRUCT_JAVA_VM)) {
			return packagePath + "mapstruct" + File.separator + className + "Struct.java";
		}
		if (template.contains(VO_JAVA_VM)) {
			return packagePath + "api" + File.separator + "vo" + File.separator + className + "VO.java";
		}

		if (template.contains(MAPPER_XML_VM)) {
			return CommonConstants.BACK_END_PROJECT + File.separator + "src" + File.separator + "main" + File.separator
					+ "resources" + File.separator + "mapper" + File.separator + className + "Mapper.xml";
		}

		if (template.contains(MENU_SQL_VM)) {
			return className.toLowerCase() + "_menu.sql";
		}

		if (template.contains(AVUE_INDEX_VUE_VM) || template.contains(ELE_INDEX_VUE_VM)) {
			return CommonConstants.FRONT_ADMIN_PROJECT + File.separator + "src" + File.separator + "views"
					+ File.separator + moduleName + File.separator + className.toLowerCase() + File.separator
					+ "index.vue";
		}

		if (template.contains(AVUE_API_JS_VM)) {
			return CommonConstants.FRONT_ADMIN_PROJECT + File.separator + "src" + File.separator + "api" + File.separator
					+ className.toLowerCase() + ".js";
		}

		if (template.contains(AVUE_CRUD_JS_VM)) {
			return CommonConstants.FRONT_ADMIN_PROJECT + File.separator + "src" + File.separator + "const"
					+ File.separator + "crud" + File.separator + className.toLowerCase() + ".js";
		}

		if (template.contains(ELE_ADD_UPDATE_VUE_VM)) {
			return CommonConstants.FRONT_ADMIN_PROJECT + File.separator + "src" + File.separator + "views"
					+ File.separator + moduleName + File.separator + className.toLowerCase() + File.separator
					+ className.toLowerCase() + "-form.vue";
		}

		if (template.contains(ELE_API_JS_VM)) {
			return CommonConstants.FRONT_ADMIN_PROJECT + File.separator + "src" + File.separator + "api" + File.separator
					+ className.toLowerCase() + ".js";
		}

		return null;
	}
	/**
	 * 根据目标数据源名称动态匹配Mapper
	 * @param dsName
	 * @return
	 */
	public GeneratorMapper getMapper(String dsName) {
		// 获取目标数据源数据库类型
		GenDatasourceConfMapper datasourceConfMapper = SpringContextHolder.getBean(GenDatasourceConfMapper.class);
		GenDatasourceConfModel datasourceConf = datasourceConfMapper
				.selectOne(Wrappers.<GenDatasourceConfModel>lambdaQuery().eq(GenDatasourceConfModel::getName, dsName));

		String dbConfType;
		// 默认MYSQL 数据源
		if (datasourceConf == null) {
			dbConfType = DsJdbcUrlEnum.MYSQL.getDbName();
		}
		else {
			dbConfType = datasourceConf.getDsType();
		}

		// 获取全部数据实现
		ApplicationContext context = SpringContextHolder.getApplicationContext();
		Map<String, GeneratorMapper> beansOfType = context.getBeansOfType(GeneratorMapper.class);

		// 根据数据类型选择mapper
		for (String key : beansOfType.keySet()) {
			if (StrUtil.containsIgnoreCase(key, dbConfType)) {
				return beansOfType.get(key);
			}
		}

		throw new IllegalArgumentException("dsName 不合法: " + dsName);
	}

}
